GGT1 and lung adenocarcinoma: GGT1 is highly expressed in the A549 lung adenocarcinoma cell line and its expression increases after IL‐1β stimulation, which rapidly converts LTC4 to LTD4 [35], and GGT1 shows an important role in the development of resistance to erlotinib in non‐small cell lung cancer (NSCLC) cells [36].